Materials Data on KCuCl3 by Materials Project

KCuCl3 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. K1+ is bonded in a 9-coordinate geometry to nine Cl1- atoms. There are a spread of K–Cl bond distances ranging from 3.15–3.73 Å. Cu2+ is bonded in a distorted rectangular see-saw-like geometry to four Cl1- atoms. There are a spread of Cu–Cl bond distances ranging from 2.26–2.32 Å. There are three inequivalent Cl1- sites. In the first Cl1- site, Cl1- is bonded in a 1-coordinate geometry to three equivalent K1+ and one Cu2+ atom. In the second Cl1- site, Cl1- is bonded in a 2-coordinate geometry to two equivalent K1+ and two equivalent Cu2+ atoms. In the third Cl1- site, Cl1- is bonded in a 1-coordinate geometry to four equivalent K1+ and one Cu2+ atom.